Unlike other lubricant eye drops which can evaporate quickly, Retaine® MGD™ provides long-lasting relief for moderate to severe dry eyes utilizing Novasorb®, a proprietary cationic oil emulsion technology (microemulsification) that effectively delivers ingredients through the electrostatic attraction between positively charged droplets and the negatively charged ocular surface. The hypotonicity of the emulsion adds moisture while the lipid component lubricates and protects the surface of the eye. It is especially helpful in conditions associated with Meibomian Gland Dysfunction.